[Credix] Minting/Redeeming/CollectProfit IXs

[crypto-vincent]

Abstract

This PR adds integration with the onchain credix smart contract by minting UXD when depositing collateral in credix and burning UXD when withdrawing collateral from credix

New instructions set:

• register_credix_lp_depository

  • init all necessary accounts
  • store important accounts address
  • init accounting storage

• mint_with_credix_lp_depository

  • take user's USDC and put it in the credix LP
  • mint UXD and give it to user in exchange

• redeem_from_credix_lp_depository

  • take user's UXD and burn it
  • withdraw USDC from credix LP and give it to user in exchange

• collect_profit_of_credix_lp_depository

  • see if the credix LP owned assets surpass outstanding UXD liabilities
  • if yes, withdraw profits into UXD's authority collateral account

• edit_credix_lp_depository

  • set and change configuration flags and accounting caps

PR Combo:

• uxd-client: [Credix] Minting/Redeeming/CollectProfit IXs #34
• uxd-program: [Credix] Minting/Redeeming/CollectProfit IXs uxd-program#213

[Orelsanpls]

Hello, have few comments, hope it helps! :)